SIMO、MIMO、干涉对准（IA）和协调多点（CoMP）的实验研究
An Experimental Investigation of SIMO, MIMO, Interference-Alignment (IA) and Coordinated Multi-Point (CoMP)
摘要：
在本文中，我们提出了干扰对齐（IA）和协调多点传输（CoMP）的实验实现。我们提供的结果与三个基站和三个移动站都有两个天线的系统。我们进一步采用OFDM调制，高阶星座，并测量许多位置的视线和非视线的干扰限制条件下。我们发现CoMP系统比IA执行更好的成本较高的回程容量的要求。在测量期间，我们还记录了用于离线处理的信道估计。我们使用这些信道估计来计算理想条件下的性能。以这种方式获得的性能估计基本上高于在端到端传输中实际观察到的性能估计，特别是在理论性能非常高的CoMP情况下。我们发现这种差异的原因是脏RF效应，如相位噪声和非线性的影响。我们能够在一定程度上模拟脏RF效应。这些模型可以用于模拟更复杂的系统，并且仍然考虑脏RF效应（例如，具有数十个移动台和基站的系统）。在我们的测量中，IA和CoMP的性能都优于单用户SIMO和MIMO的参考实现。
英文摘要：
In this paper we present experimental implementations of interference alignment (IA) and coordinated multi-point transmission (CoMP). We provide results for a system with three base-stations and three mobile-stations all having two antennas. We further employ OFDM modulation, with high-order constellations, and measure many positions both line-of-sight and non-line-of-sight under interference limited conditions. We find the CoMP system to perform better than IA at the cost of a higher back-haul capacity requirement. During the measurements we also logged the channel estimates for off-line processing. We use these channel estimates to calculate the performance under ideal conditions. The performance estimates obtained this way is substantially higher than what is actually observed in the end-to-end transmissions---in particular in the CoMP case where the theoretical performance is very high. We find the reason for this discrepancy to be the impact of dirty-RF effects such as phase-noise and non-linearities. We are able to model the dirty-RF effects to some extent. These models can be used to simulate more complex systems and still account for the dirty-RF effects (e.g., systems with tens of mobiles and base-stations). Both IA and CoMP perform better than reference implementations of single-user SIMO and MIMO in our measurements.
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